Jean-Pierre Leyvraz was one of my professors at Geneva University in the 80's. I remember great lectures and seminars he gave on the history of philosophy (notably Spinoza, Schopenhauer, Kierkegaard). I had this book in my hands but didn't read it entirely. I think there was something between Levinas and Jonas, in his views, but that's probably an anachronism in J.P. Leyvraz's train of thought. Once, at one of those drinks we were taking gladly in Genevese tea-rooms after courses, we asked him about giving a seminar on his own phenomenological works but he looked a little bit troubled and recognised having abandoned pure phenomenology after studying Wittgenstein in depth. I hope he is having a retirement as happy as it can be. May I ask you what is your project about this book?